There are a broad range of addition reactions to alkenes. they convert alkenes to a number of other structural types. find an example and show one application of its use in preparative chemistry.

clouds form

solid ice forms on leaves.

water droplets form on grass.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).